US4586045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide band multiple side-lobe canceller
Assignee: United States Department of the Air Force
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Filing: 1970-10-05
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Granted: 1986-04-29
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Expires: 1990-10-05
Abstract
Abstract An IF side-lobe canceller having a main channel and a pair of auxiliary channels in which the signal from the main channel is mixed with a stable local oscillator and fed to a subtractor, while in each of the pair of auxiliary channels the signal from an omnidirectional antenna is fed to a mixer and then to the subtractor. The subtractor's output is fed to mixers together with the signals from the omnidirectional antennas. The outputs of these mixers are fed to additional mixers together with the mixed outputs of the stable local oscillator and a second oscillator.
Inventors
- 👤 John W. Downie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/2813; G01S7/36; H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; H01Q3/2611; H01Q3/2629; H01Q3/2635
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
An IF side-lobe canceller comprising: (a) a main channel including, (1) a radar antenna, (2) a first local oscillator, (3) a first main mixer fed by the radar antenna and the first local oscillator, (4) a subtractor to which the output of the first mixer constitutes one input, (5) a second local oscillator, and (6) a second main mixer fed by the first and second local oscillators, and (b) a plurality of auxiliary channels, each channel including, (1) an omnidirectional antenna, (2) a first auxiliary mixer fed by the omnidirectional antenna and the subtractor, (3) a second auxiliary mixer fed by the first auxiliary mixer and the second main mixer, (4) a third auxiliary mixer fed by the second auxiliary mixer and the second main mixer, and (5) a fourth auxiliary mixer fed by the third auxiliary mixer and the omnidirectional antenna, the output of the fourth auxiliary mixer being fed to the subtractor.
Claim 2
Dependent Claim
154 words
An IF side-lobe canceller comprising: (a) a main channel including, (1) a radar antenna, (2) a first local oscillator, (3) a first main mixer fed by the radar antenna and the first local oscillator, (4) a subtractor to which the output of the first mixer constitutes one input, (5) a second local oscillator, and (6) a second main mixer fed by the first and second local oscillators, and (b) a plurality of auxiliary channels, each channel including, (1) an omnidirectional antenna, (2) a first auxiliary mixer fed by the omnidirectional antenna and the subtractor, (3) a second auxiliary mixer fed by the first auxiliary mixer and the second main mixer, (4) a third auxiliary mixer fed by the second auxiliary mixer and the second main mixer, and (5) a fourth auxiliary mixer fed by the third auxiliary mixer and the omnidirectional antenna, the output of the fourth auxiliary mixer being fed to the subtractor.
Claim 3
Dependent Claim
27 words
An IF side-lobe canceller according to claim 1 which further comprises in each auxiliary channel a narrow band filter interposed between the second and third auxiliary mixers.
Claim 4
Dependent Claim
23 words
An If side-lobe canceller according to claim 2 which further comprises a duplexer interposed between the radar antenna and the first main mixer.
References Cited (Backward Citations)
US4010469A
Cited
US4044359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |